On 2/8/2016 9:54 PM, Chris Murphy wrote:
Secure erase is really the only thing to use on SSDs. Writing a pile of zeros just increases wear (minor negative) but also doesn't actually set the cells to the state required to accept a new write, so you've just added a lot more work for the SSD's garbage collector and wear leveling, so it's going to be slower than before you did the zeroing. Secure erase on an SSD erases the cells so they're ready to accept writes.
at least one SSD I had, the vendor told me writing a full pass of zeros on it via dd or whatever would completely reset the garbage collection and effectively defrag it.
-- john r pierce, recycling bits in santa cruz _______________________________________________ CentOS mailing list CentOS@centos.org https://lists.centos.org/mailman/listinfo/centos
